Tom Cruise surprises fans at Comic-Con

People camped out, slept on concrete, ate nothing but Doritos and Mountain Dew to get into Hall H at Comic-Con on Saturday.

It was probably all worth it: The day kicked off with a Warner Bros. and Legendary Pictures showcase filled with big-name stars, exclusive clips and a major announcement.

For the next Superman movie, director Zack Snyder announced that the superhero will team up with Batman. Bam! Pow! Zow! That was an announcement that caused one of the biggest, loudest fan reactions in the history of Hall H.

In the biggest surprise celebrity appearance of the morning — perhaps even the weekend — actor Tom Cruise showed up at Hall H to promote his latest film, "Edge of Tomorrow," about a soldier fighting in a war against aliens.

The actor entered the room and immediately began bantering with moderator Chris Hardwick. The two began singing a Journey" song together. He then pointed out that fellow actor Bill Paxton was sitting in the audience and asked him to shower co-star Emily Blunt with compliments.

He was also enthusiastic about being at the convention.

"This is awesome," Cruise said to a fan dressed in a cape and mask. "I've been waiting to see a lot of characters here at Comic-Con."

Though the actors tried to discuss the film directed by Doug Liman, there was too much giddiness in the room for serious discussion and analysis. But he did offer a personal sentiment.

"I just want to entertain you all," he said. "I want to do whatever I can, and it's a dream of mine to be able to do it."

The film is scheduled to be released June 6, 2014.

"Gravity"

Mexican Director Alfonso Cuaron brought highly intense footage of his film, "Gravity," which is about two astronauts trapped in space. The movie stars just George Clooney and Sandra Bullock, but only Bullock showed up Saturday.

The actress — making her Comic-Con debut — was easygoing and comfortable bantering with fans. She even told one guy in a cape and mask that he had a sexy voice.

Bullock discussed the difficulty of acting in a confined, robotic space suit with cameras flying toward her face at all times. It was a role that was challenging both mentally — since she admitted she's afraid of heights — and physically.

"I was a dancer growing up, and I used my dance training to keep my core strong for such a demanding role," she said.

"Gravity" is scheduled for release Oct. 4.

"Godzilla"

Last year, director Gareth Edwards showed a super short "mood piece" of "Godzilla," a movie he hadn't even started shooting.

This year, now that he has some film recorded, he returned with a menacing clip that showed a ravaged city along with a very quick glimpse of the terrifying lizard.

"Gozilla was always my favorite monster when I was young because he was unapologetic," said Bryan Cranston, who stars in the film.

The panel, which also featured Elizabeth Olsen and Aaron Taylor-Johnson, touched on the pressure and difficulty in making a good "Godzilla" film for this generation. Even the people in Canada, where the movie was shot, told Edwards not to "(bleep) it up."

"Godzilla" is scheduled for release on May 16, 2014.

"Seventh Son"

The day actually opened with Jeff Bridges, and he was in full The Dude mood.

The actor was loose and ready to banter. He enthusiastically presented footage of his upcoming, sweeping adventure film that also stars Julianne Moore, Ben Barnes and Kit Harington. Though Moore didn't make an appearance, female fans were fine with Barnes and Harington handling questions from moderator Chris Hardwick. Antje Traue of "Man of Steel" was also popular among the Hall H masses.

The panel was actually quite inspirational with Bridges reading a quote and discussing the power of imagination. A fan asked Bridges about doing difficult stunts at his age. The actor admitted it wasn't easy but said "acting is advanced pretend."